The Collaborative International Dictionary of English v.0.48:

Compeer \Com*peer"\, [OE. comper, through French fr. L. compar;
   com- + par equal. See Peer an equal, and cf. 1st
   Compare.]
   An equal, as in rank, age, prowess, etc.; a companion; a
   comrade; a mate.
   [1913 Webster]

         And him thus answer'd soon his bold compeer. --Milton.
   [1913 Webster]

         His compeer in arms.                     --Ford.
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The Collaborative International Dictionary of English v.0.48:

Compeer \Com*peer"\, v. t.
   To be equal with; to match. [R.]
   [1913 Webster]

         In my rights,
         By me invested, he compeers the best.    --Shak.
   [1913 Webster] Compeer

The Collaborative International Dictionary of English v.0.48:

Compeer \Com*peer"\, Compeir \Com*peir"\, v. i.
   See Compear.
   [1913 Webster]

WordNet (r) 3.0 (2006):

compeer
    n 1: a person who is of equal standing with another in a group
         [syn: peer, equal, match, compeer]